1. Computers Are Your Future Twelfth Edition*
Computers Are Your Future Twelfth Edition
07/16/96
Chapter 2: Input and Output
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

2. Input and Output *
07/16/96
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

3. *
Objectives
07/16/96
Explain the various types of keyboards and the purpose of the special keys on the keyboard, identify the commonly used pointing devices, and list alternative input devices.
List the types of monitors and the characteristics that determine a monitor’s quality.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

4. *
Objectives
07/16/96
Identify the two major types of printers and indicate the advantages and disadvantages of each.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

5. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Input
Data or instructions entered into a computer
Input device
Hardware that gives users the ability to enter data and instructions into the computer’s random access memory (RAM)
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6. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Input device (con’t.)
Keyboard
Most common input device—enables data and instruction entry through the use of a variety of keys
Enhanced keyboards—additional keys, such as media control buttons to adjust speaker volume, or Internet control buttons that open , a browser, or a search window with a single keystroke
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7. Input Devices: Giving Commands*
07/16/96
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

8. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Key matrix
Grid of circuits located under the keys
Character map
Chart that tells the processor what key has been pressed
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9. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Insertion point
Blinking vertical line, underscore, or highlighted box
Wireless keyboards
Connect to the computer through infrared (IR), radio frequency (RF), or Bluetooth connections
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10. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Keyboards
Connect with:
Universal Serial Bus (USB) connector
PS/2 cable
Infrared
Radio frequency
Bluetooth
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11. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Special keyboard keys include:
Cursor movement keys (arrow keys)—set of four keys that move the cursor up, down, right, or left
Toggle keys—either on or off
Function keys—perform specific actions depending on the program
Modifier keys—used for shortcuts
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12. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Alternate keyboards
Virtual (soft keyboard or on-screen keyboard)—a touch-sensitive screen; accepts input with a stylus or finger
Smartphone
Mini-keyboard—keys for each letter of the alphabet; option on many smartphones
Keypad—smaller, more compact, has keys that represent multiple letters
Virtual laser—used with devices as smartphones, an alternate way to do , word processing, spreadsheets
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13. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Alternate keyboards (con’t.)
Flexible keyboards—full-sized, lightweight portable devices
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14. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Pointing device
Controls an on-screen pointer’s movements
Pointer
On-screen symbol that signifies the command, input, or possible response
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15. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Mouse Types
Optical—most popular pointing device
Travel—all the capabilities of a normal mouse, half the size
Wheel—has a wheel for easy vertical scrolling
Wireless—connects through an infrared or radio signal (RF). Battery operated
Air—does not need to work on a surface, works as it moves through the air
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16. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Mouse alternatives
Trackball
Pointing stick
Touchpad (also called a trackpad)
Click wheel
Gaming Controllers
Stylus
Touch screen
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

17. Trackball
Is a pointing device that contains a movable ball held in a cradle. The user rolls the ball to move a pointer
From one to three keys can be located in various positions to perform equivalent mouse actions like a click
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall

18. Pointing Stick
A pointing device that looks like a pencil eraser between the G,H and B keys
Pressure sensitive and is pressed and moved in various directions with the forefinger
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall

19. Touch pads (trackpads)
A small, pressure sensitive, flat surface located on the notebook
Controls pointer by moving and tapping your fingers on the surface of the pad
Mouse (key term) controls a mouse pointer (key term) that appears in the shape of an arrow
Some mice have a wheel button (key term) for scrolling. The Optical Mouse (key term) is the most widely used
Mouse types
Optical mouse (Key Term) – has no moving parts
Emits and senses light to detect mouse movement
Can be used on any surface
Cordless mouse (Key Term) or wireless mouse (Key Term) – battery powered
Uses radio waves or infrared light waves
Touch pads (key term) –controls the pointer by moving and tapping your fingers on the surface of a pad

20. Click Wheel
A pad that looks like a circle that is used to move through song lists, movie lists or photos
Method of navigation on the iPod
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall

21. Gaming Controllers Provide input to computer games
Joysticks use pressure and direction of the stick
Gaming mice are similar to a mouse but high precision (sensitivity)
Game pads use both hands
Motion sensing device control games by user movement
Joystick (key term)– control game actions by varying pressure, speed and direction
Gaming Mouse – similar to traditional mice with higher precision, faster responsiveness, programmable buttons, and better ergonomics
Game pads (key term) – held by two hands
Motion sensing device (key term) – control games by user movement

22. Touch Screen
A display screen that is sensitive to the touch of a finger or stylus
Stylus is a pen-like device
Used on tablets
Uses handwriting recognition software
Common on mobile devices
Smart Mobiles
ATM machines
Airport kiosks
Desktop monitors
Multitouch screen (key term) – can be touched with more than one finger, which allows for interactions such as rotating graphical objects on the screen with your hand or zooming in and out by pinching and stretching your fingers. These screens are common on mobile devices such as the Apple iPhone, and some notebook computers and desktop monitors.
Stylus works using handwriting recognition software. It is a pen-like device.

23. Input Devices: Giving Commands*
Input Devices: Giving Commands
07/16/96
Alternative input devices include:
Scanners
Magnetic stripe card reader
Bar code reader
Optical mark reader (OMR)
Digital cameras and digital video cameras
Webcams
Microphones for speech or voice recognition
Radio frequency identification (RFID reader)
Magnetic-ink character recognition (MICR reader)
Biometric input device
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

24. Scanning Devices: convert scanned data into a form the system unit can process
Magnetic Stripe Card Reader: reads information stored on magnetic strips that are usually located on the back of credit cards or gift cards
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall

25. Barcode Reader: used to read an item’s universal product code
Barcode Reader: used to read an item’s universal product code For example, Fedex uses a barcode system to identify and track packages
Optical mark reader (OMR): : special scanning device which scans your grid-like Scantron test form and senses the magnetized marks from your pencil. Used to check optic sheets
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall

26. Webcam: camera attached to the computer, can be used to hold live chat
Digital Camera: Capture images digitally and store in memory.can also input images into your system directly  
Webcam: camera attached to the computer,
can be used to hold live chat
sessions and make video
phone calls
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall

27. Biometric Input Device: uses physical or chemical features of an individual’s body to provide a unique method of identification. Example: retina scanner, fingerprint reader, facial scanner
Radio Frequency Identification Reader: used for the purposes of automatically identifying and tracking tags (chips) attached to objects. Tags contain electronically stored information. To read passports, tracking pets
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall

28. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Output devices
Enable users to see, hear, or feel the end result of processing operations
The two most popular output devices
Monitors (also called displays)
Printers
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

29. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Monitors
Known as screens or display screens and present visual images of text and graphic
Display a temporary copy (soft copy) of processed data
Types of monitors include:
Cathode-ray tube (CRT, legacy technology),
Liquid crystal display (LCD, older monitors),
Light Emitting Diode (LED, more advanced backlighting)
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30. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Monitors (con’t.)
LCD (flat-panel) displays:
Have a thin profile
Are used with newer desktops and notebooks
Have largely replaced CRT monitors
May accommodate high-definition video
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

31. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Monitors (con’t.)
Size is diagonal measurement
Size is straightforward for LCDs but more complex for CRTs.
Quoted size—the size of the screen
Viewable area—the area unobstructed by the housing
Both must be disclosed by the manufacturer.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

32. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Resolution
Refers to the sharpness of an image
Number of pixels (picture elements) controls the resolution
Video Graphics Array (VGA)—lowest resolution standard (640 × 480)
Extended Graphics Array (XGA)—most used by computers today (1024 × 768)
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33. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers
Supply a hard copy of output displayed on a computer’s monitor
Types include:
Inkjet
Laser
Dot-matrix
Thermal-transfer (sometimes called dye sublimation printers)
Photo
Plotters
3D Printers
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34. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Inkjet —popular with home users
Provide excellent images—made up of small dots
Advantages:
Inexpensive
Generate professional color output
Disadvantages:
Relatively slow
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

35. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Laser
Use electrostatic reproductive technology to produce high-quality output
Advantages:
High-resolution
Print faster than inkjet printers
Black-and-white printing costs less per page than inkjet printing
Disadvantages
Color laser printers more expensive
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

36. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Dot-matrix (impact)
Older, less popular
Used mostly for printing multipart forms and backup copies
Advantages
Able to print 3,000 lines per minute
Disadvantages
Poor print quality
Noisy
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

37. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Thermal-transfer printers
Use a heat process to transfer an impression onto paper
Useful for issuing tickets or receipts
Advantages
High-quality images
Popular for mobile printing
Disadvantages
High-quality thermal printers are expensive
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

38. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Printers (con’t.)
Photo
Uses special ink and paper
Often are inkjet printers
Prints directly from a digital camera or memory card
Plotters
Produce images through moving ink pens
Used for making oversized prints (i.e., maps, charts, blueprints)
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

39. Used to make three dimensional solid objects from a digital file
3D Printers
Used to make three dimensional solid objects from a digital file
You can create virtual design of the object in 3D modeling programs
Create 3-D shapes adds a thin layer of material repeatedly until the item
is created
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40. Output Devices: Engaging Our Senses*
Output Devices: Engaging Our Senses
07/16/96
Other output devices include:
Speakers
Headphones
LCD projectors
DLP (digital light-processing) projectors
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

41. Combination Input and Output Devices
Headsets
Combine a microphone and headphones
Multifunctional devices (MFD)
Also called all-in-one printers
Cost efficient but lower quality
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall

42. *
Summary
07/16/96
Explain the various types of keyboards and the purpose of the special keys on the keyboard, identify the commonly used pointing devices, and list alternative input devices.
List the types of monitors and the characteristics that determine a monitor’s quality.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

43. *
Summary
07/16/96
Identify the two major types of printers and indicate the advantages and disadvantages of each.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall *

44. Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. Printed in the United States of America.
Copyright © 2012 Pearson Education, Inc.  
Publishing as Prentice Hall
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall